Creating a Program in LD for Application Execution

At a Glance

This section executes the counting start up and the operator screen animation.

Illustration of the Application Section

The section below is part of the MAST task:

Description of the Application Section

The first line is used to commande the counter.
The other three lines are used to simulate the different box positions on the conveyor.
The last part is used to control the variables which allow the function enabling (See Illustration of the Labelling _Program Section
When Run switches to ‘1’, Waiting_First_Part is set to ‘1’.
A sensor signal triggers the flag Sync_ref_flag which resets Waiting_first_part to '0' and sets Waiting_other_parts to '1'.

Procedure for Creating an LD Section

The table below describes the procedure for creating part of the Application section.

Step	Action
1	In Project Browser\Program\Tasks, double-click on MAST.
2	Right click on Section then select New section. Name this section Application, then select the language type LD. The Edit window opens.
3	To create the contact Encoder.Sync_Ref_Flag, click on then place it in the editor. Double-click on this contact then on . The Instance Selection window opens. Validate the Inside structure checkbox and click on in front of the Encoder variable and select Sync_Ref_Flag in the list. Confirm with OK.
4	To use the RS block you must instantiate it. Right click in the editor then click on Select data and on . Click on the Function and Function Block Types tab. Click on Libset and select the RS block in the list then confirm with OK and position your block. To link the Encoder.Sync_Ref_Flag contact to the S Rnput of the RS block, align the contact and the input horizontally, click on and position the link between the contact and the input.

NOTE: For more information on creating an LD section, refer to chapter LD Editor.